Kyle Navin, 27, of Bridgeport, is accused of shooting and killing his parents, Jeffrey and Jeanette Navin, of Easton.

The couple was reported missing on Aug. 4 and their bodies were found in December in the yard of a vacant home in neighboring Weston, which their son had visited before, the property owner told police.

Jeffrey Navin, 56, was president of J&J Refuse in Westport, while Jeannette Navin, 55, was a school aide in Weston.

Kyle Navin is accused of shooting his mother inside his truck and shooting his father in the basement of the Bridgeport home his parents bought him.

Court documents provide details on the police investigation and what led to authorities filing charges.

Police said they received an anonymous tip on Aug. 20, days after his parents disappeared, that Kyle Navin had been thrown out of a back-pain treatment program because he was using heroin, which police confirmed with the pain clinic, according to the warrant for Kyle Navin's arrest.

"It's not a trial, and I think experience has taught all of us that we have reserve our judgment about these situations until all of the facts are known, and I'm asking that that be done," Riccio said.

Police have said they believe he killed his parents for money.

A few days before she vanished, his mother told a friend the couple planned to cut Kyle Navin out of their will, sell their trash-hauling business and leave their son without any financial support from the family, according to an affidavit from police.

Jeanette Navin told a longtime acquaintance her relationship with her son had been "very tempestuous" and she suspected Kyle Navin of abusing drugs, according to the affidavit. She also confided that she and her husband had bought Kyle Navin a house, but he was failing to pay the mortgage and taxes.

Months prior, in May, Kyle Navin allegedly discussed his intentions in text messages with his girlfriend, who has also been charged in connection with the case. According to the warrant for his arrest, Kyle Navin said they needed to "figure out the best way to take (his parents) down whether it is get some money out of them somehow (expletive) him at the business the house something."

Then, in July, he mentioned a plan to "solve every single problem and give us a wealthy amazing life," according to the warrant. Later in the conversation, he allegedly wrote, "Wipe out the infection and get $ for life. It's perfect plan."

Kyle Navin's text messages also came into play the day his parents disappeared. According to police, Jeffrey Navin texted his son Aug. 4 – right before he vanished – saying he would not go home until he knew his wife was OK. He also allegedly asked if Kyle Navin hurt his mother.

"No absolutely not. Why would you think," Kyle Navin responded, according to the affidavit.

Soon after the exchange, the couple's cellphones went inactive. Five days later, authorities found their pickup truck with a shattered window in a Westport commuter lot.

Police interviewed the couple's younger son, Taylor, as part of the investigation. When they told him Kyle Navin was a person of interest, Taylor Navin, who lives in Mississippi, allegedly responded, "When I heard my parents were missing I thought to myself, 'They either went on vacation, or my brother did something to them,'" according to the warrant.